You can look at the bottom of any page in JIRA to see the version.
But as you say "web accessed", I would guess you're on "Cloud" - if your url for access has .atlassian.net in it, then it is Cloud.
For that, you'll need to select Software in your my.Atlassian account that was used to set up the trial.
>he problem is that it accept only bug related issues. Instead, I need to track requirements
Off the shelf, I suspect you've simply started with a bug-tracking type project. You can add requirements to that as a new issue type, or set up a new project for requirements, or, or, or - JIRA is very very flexible and can be used for all sorts of things.
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